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Rotation detector and method of producing a rotor in the rotation detector

a technology of rotation detector and rotor, which is applied in the direction of linear/angular speed measurement, electrical/magnetically converting sensor output, instruments, etc., can solve the problems of low working efficiency and inapplicability

Active Publication Date: 2016-06-07
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables efficient production and accurate detection of rotational position and speed, reducing the need for precise machining and expanding material options beyond sinterable materials.

Problems solved by technology

However, according to Japanese Patent No. 4085074, the teeth are once all formed even on the upper part and are, thereafter, all ground leaving one tooth accompanied, therefore, resulting in very low working efficiency.
Therefore, when it is attempted to produce a rotor by using steel to attain higher strength, the method disclosed by Japanese Unexamined Patent Publication No. 4-335111 cannot be applied.

Method used

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  • Rotation detector and method of producing a rotor in the rotation detector
  • Rotation detector and method of producing a rotor in the rotation detector
  • Rotation detector and method of producing a rotor in the rotation detector

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first embodiment

[0046]FIG. 1A is a perspective view of a rotor blank based on the present invention, and FIG. 1B is a side view of the rotor blank shown in FIG. 1A. The rotor blank stands for a member in a state prior to forming teeth.

[0047]In the drawings, the rotor blank 1a includes a first cylindrical portion 10 and a second cylindrical portion 20 which is in concentric with the first cylindrical portion 10 and is deviated in the axial direction. As shown, the circumferential surface of the second cylindrical portion 20 includes a first partial circumferential surface 21 which is in flush with a circumferential surface 11 of the first cylindrical portion 10 and a second partial circumferential surface 22 having a radius smaller than a radius of the first cylindrical portion 10. In this connection, the first partial circumferential surface 21 has a radius equal to the radius of the first cylindrical portion 10 and is continuous to the circumferential surface 11 of the first cylindrical portion 10...

second embodiment

[0063]FIG. 4 is a perspective view of the rotor based on the present invention. In FIG. 4, the tooth 25 of the second cylindrical portion 20 is not continuous to the tooth 15a of the first cylindrical portion 10, but a groove 29 is formed between them. The groove 29 is desirably formed while the rotor blank 1a is being produced. However, the groove 29, may be formed after the teeth 15a and 25 have been formed.

[0064]Considered below is a case where the groove 29 has not been formed in the rotor 1b shown in FIG. 4. The magnetic flux detected by the first reluctance element 31 differs depending upon when the first reluctance element 31 is facing the tooth of the AB-phase to-be-detected portion that is not neighboring the tooth 25 of the Z-phase to-be-detected portion, i.e., when the first reluctance element 31 is facing the tooth 15b and when the first reluctance element 31 is facing the tooth 15a of the AB-phase to-be-detected portion neighboring the tooth 25 of the Z-phase to-be-dete...

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Abstract

A rotor (1b) includes a first cylindrical portion (10), and a second cylindrical portion (20) including a first partial circumferential surface (21) having a width narrower than that of the first cylindrical portion (10) in the circumferential direction, and a second partial circumferential surface (22) having a radius smaller than a radius of the first partial circumferential surface; the rotor, further, including a first to-be-detected portion having a plurality of teeth (15), and a second to-be-detected portion having at least one tooth (25), and wherein the at least one tooth of the second cylindrical portion and the tooth of the first cylindrical portion corresponding to the at least one tooth are formed in one operation by machining.

Description

RELATED APPLICATIONS[0001]The present application claims priority from Japanese Application No. 2011-193658, filed Sep. 6, 2011, the disclosure of which is hereby incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]This invention relates to a rotation detector and to a method of producing a rotor in the rotation detector.[0004]2. Description of the Related Art[0005]A rotation detector for detecting the angle of rotation of a rotary member by utilizing magnetism is known as a magnetic encoder. The rotation detector includes a part that is periodically indented, such as a gear.[0006]FIG. 9 is an exploded perspective view of a rotor in a rotation detector according to a prior art. As shown in FIG. 9, the conventional rotation detector includes a gear 100 for detecting position signals to detect the rotational position and the speed of rotation, and a ring 200 for detecting a signal of one rotation to detect the position of origin in...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01B7/14G01B7/30H01F5/00G01P3/488G01D5/14
CPCG01P3/488G01D5/147
Inventor ODAKA, SHUNICHI
Owner FANUC LTD